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RE: [OM] More Calcs on Flash GN

Subject: RE: [OM] More Calcs on Flash GN
From: Chip Stratton <cstrat@xxxxxxxxxx>
Date: Wed, 08 Mar 2000 09:50:18 -0600
> Dear OMer's,
>                       a periodic question that appears here is:  
> What is the 
> relationship between Flash GN and stored energy in the Flash 
> capacitor? This 
> depends on reflector efficiency, area of coverage and flash tube 
> efficiency. 
> Here is a comparison between the OM  T20 and T32 flashes showing 
> that despite 
> the differences in flash tube,reflector and stored energy the overall 
> efficiency is almost identical. 
> 
> T32 Flash energy  70 Joules (or Watt-secs)        GN 32 (m)    
> coverage 24mm 
> Lens
> T20 Flash energy  25 Joules  (or W-s)                GN 20 (m)    
> coverage 
> 24mm Lens


Except  that  the T20 only gives coverage for a 35mm lens.

Chip Stratton
cstrat@xxxxxxxxx

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